<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>
    var a = 1;
    var b = "abc";

    let c = 2;
    c = 3;
    const d = 4;
</script>
<script>
    {
        var e = 100;
        let  f = 200;

    }
    console.log(e);
    console.log(f);
</script>
</html>